摘要
利用CVI法,在两种不同类型的国产SiC纤维束中引入(PyC/SiC)_4或(PyC/SiC)8多层界面,并进一步致密化,制备含不同纤维种类和界面类型的SiC_f/SiCMini复合材料。研究纤维种类和界面类型对SiC_f/SiCMini复合材料力学性能和断裂机制的影响。结果表明:致密化的SiC_f/SiCMini复合材料已形成一个整体,在纤维和基体连接处可观察到明显的界面层,且界面厚度均匀;A/(PyC/SiC)_4/SiC、B/(PyC/SiC)_4/SiC、A/(PyC/SiC)8/SiC三种SiC_f/SiC Mini复合材料的最大拉伸强度分别达到466,350和330 MPa,最终拉伸应变分别达到0.519%,0.219%和0.330%;拉伸断口均有纤维拔出,且随纤维种类或界面类型不同,纤维拔出长度和断口形貌有所差异。其中A/(PyC/SiC)_4/SiC以ModelⅡ断裂机制发生断裂,B/(PyC/SiC)_4/SiC和A/(PyC/SiC)8/SiC以ModelⅠ断裂机制发生断裂。
(PyC/SiC)4or(PyC/SiC)8multi-layer interphases were introduced into two types of SiC fiber bundles by CVI method and further densified with SiC to obtain SiCf/SiC minicomposites.The effects of fiber types and interface types on mechanical properties and fracture mechanism of SiCf/SiC minicomposites were studied.The results show that,the densified SiCf/SiC minicomposite is a whole.In the minicomposites,a clear interface layer with an uniform thickness can be observed between fiber and matrix.The maximum tensile strength of A/(PyC/SiC)4/SiC,B/(PyC/SiC)4/SiC and A/(PyC/SiC)8/SiC minicomposites are466,350and330MPa respectively,with the ultimate tensile strain of0.519%,0.219%and0.330%,respectively.In addition,the fracture morphologies of minicomposites and the length of pull-out fiber with different types of reinforced fiber and interface are quite different,indicated a different fracture mode.The A/(PyC/SiC)4/SiC fractures in ModelⅡ,B/(PyC/SiC)4/SiC and A/(PyC/SiC)8/SiC fracture in ModelⅠ.
作者
杨平
张瑞谦
李月
陈招科
何宗倍
刘桂良
付道贵
孙威
王雅雷
熊翔
YANG Ping;ZHANG Ruiqian;LI Yue;CHEN Zhaoke;HE Zhongbei;LIU Guiliang;FU Daogui;SUN Wei;WANG Yalei;XIONG Xiang(Key Laboratory of Lightweight, High Strength Structural Materials, Powder Metallurgy Research Institute,Central South University, Changsha 410083, China;Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2018年第6期553-561,共9页
Materials Science and Engineering of Powder Metallurgy
基金
反应堆燃料及材料重点实验室基金.
